Internal grinding tool



@ci. 4, 1949. s. R. KELLER INTERNAL GRINDING TOOL 2 Sheets-Sheet 1 FiledAug. 27. 1947 ATTORNEYS I. m NW ww k .....L mm

at, 4, 1949. Y s. R. KELLER 2,483,773

INTERNAL GRINDING TOOL Filed Aug. 27, 1947 2 Sheets-Sheet 2 INVEIjJTOR.r kazrcer/fhe/Zer ATTEI RN EYE Patented Oct. 4, 1949 UNITED STATESPATENT OFFICE Spencer R. Keller, Handley, W. Va.

Application August 27, 1947, Serial No. 770,881

1 Claim. 1

This invention relates to internal grinding tools.

It is an object of the present invention to provide an internal grindingtool having separable stone grinding elements which can be adjusted todifferent positions for grinding openings of different diameters whereinmeans are provided for keeping the elements separated when the adjustingelement is in position to allow the expansion of the stone elements.

It is another object of the present invention to provide an adjustableinternal grinding tool which has simple means for effecting theadjustment of the grinding stone elements, which is of simpleconstruction, has a small number of parts, inexpensive to manufactureand efficient in operation.

For other objects and for a better understanding of the invention,reference may be had to the following detailed description taken inconnection with the accompanying drawing, in which Fig. 1 is a sideelevational view of the grinding tool embodying the features of thepresent invention.

Fig. 2 is a fragmentary end elevational view of the tool looking at thespindle end of the same.

Fig. 3 is an end elevational view of the tool looking upon the clampingplates for retaining the stone elements in place.

Fig. 4 is a longitudinal cross-sectional view taken generally on line4-4 of Fig. 1.

Fig. 5 is a transverse cross-sectional view taken on line 5--5 of Fig.4.

Fig. 6 is an elevational view looking upon the spindle part with theother parts removed from. the same.

Fig. '7 is an end elevational view of the stone element carrying parts.

Referring now to the figures, l represents a spindle member having athreaded projection ll thereon and a shoulder l2 against which a sleeveI3 is fitted. The sleeve 13 has forwardly extending side portions 14 andI between which stone element carrying members I1 and I8 are extended.The sleeve member also has elongated slots diametrically disposed fromone another as indicated at l9 into which are extended threadedprojections 2| of the stone element carrying members I! and I8. Thesemembers while extending into the elongated slots I9, are guided betweenthe portions [4 and I5. These members I! and I8 are retained againstaxial displacement in the slots l9 respectively by pairs of lock nuts22. Inasmuch as the slots I9 are elongated the members I! can moveinwardly or outwardly to the desired positions. Upon the sleeve l3 thereis provided.

threads 24 over which an adjusting ring 25 can be extended and locked bya set screw 26. The members I! and I8 respectively have forwardlyextending projections 26 on which stone elements 27' are respectivelysupported. These stone elements are of half circular shape and aredisposed between clamping plates 28 and 29 and retained on theprojections by a nut 31. The members ll and [B have inclined edges 32upon which the forward end of adjusting ring 25 is extended. If theadjusting ring is extended forwardly, the stone elements will be movedinwardly to operate upon a narrow diameter opening. If the adjustingring 25 is moved rearwardly, the members I1 and 18 can be separated to agreat extent so that the stone elements can work on a larger diameteropening. The elements [1 and i8 have respectively holes 34 for receivinga compression spring 35 serving to maintain the members 11 and i8against the end of the adjusting sleeve 25. The members I! and I8 willbe guided in their outward movement by the inner side faces as indicatedat 36 on the extensions l4 and I5 of the sleeve 13.

The adjusting ring 25 is knurled as indicated at 38 in Fig. 1. Sleeve I3is also knurled as indicated at 39.

The clamping plates 28 and 29 have lips on their bottom edges asindicated at 41 so as to lock the plates with the stone element toprevent relative rotation therebetween. Recesses or flattened portions43 are provided on the sleeve l3 to accommodate the lock nuts 22.

While various changes may be made in the detail construction, it shallbe understood that such changes shall be within the spirit and scope ofthe present invention as defined by the appended claim.

I claim:

An adjustable grinding tool for grinding internal openings comprising aspindle having a central threaded projection thereon and an annularshoulder at the rear of the projection on the spindle, a sleeve on theprojection abutting the shoulder end having longitudinally extendingelongated openings, stone element carrying members having threadedprojections extending into the opening and adapted to be adjustedradially with respect thereto, and means for securing the projectionswithin the openings against axial displacement therefrom, and saidsleeve is provided with recesses for the accommodation of said means,oppositely extending threaded projections on said stone element carryingmembers stone elements connected respectively to the oppositelyextending projections on the stone element car- REFERENCES CITED ryingmembers an adjusting ring on the exterior The following references areof record in the of the sleeve and adjustable axially thereover, saidfile of this patent:

stone element carrying members having respectively inclined edgesadapted to cooperate with 3 U E S ATES PATENTS the outer end of theadjusting ring to limit their Number Name Date outward movement, saidsleeve having guide pro- 1,523649 Karstens Jam 20, 1925 J' ctionsextending respectively at opposite sides 1,722,301 Kavle July 30 1929 ofth stone element carrying members, said stone element carrying membershaving opposing open- 10 ings, and spring means disposed in the openingswhereby to keep the members extended outwardly.

SPENCER R. KELLER.

